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The products listed represent only a small selection of the available IPS product line.
To discuss your specific application with an experienced technician.

Please Call 618-465-7623
<< Product 6 of 11 >>

Dwyer Series 638 Pressure Transmitter (Standard)

Discontinued

Please Call 1-618-465-7623 for a Quote on this product!
Description

 

Series 638 Pressure Transmitter

Ranges to 10,000 PSI

0.50% Full Span Accuracy, 4-20 Ma Signal

 

 

Series 638 Pressure Transmitters employ a polysilicon sensor for superior longterm stability and repeatability with ±0.5% accuracy. They are FM approved intrinsically safe. Stainless steel NEMA 4X enclosure is ideal for corrosive media in hazardous environments. Output is 4-20 mA with 10-30 VDC power supply. NIST traceability with calibration certification is standard.

The 638 Series Pressure Transmitter is ideal corrosive media in harsh environments!

 

 

FEATURES:

  • Service: Liquid, Gas or vapor

  • Process Connection:  1/8" male NPT

  • Wetted Material: 17-4 PH SS

  • Accuracy: ±0.50% FS

  • Temperature Limits: -20 to 180°F

  • Pressure Limits: 2X Maximum range

  • Supply Voltage: 10 to 30 VDC

  • Output: 4 to 20 ma 2-wire

  • Zero and Span Adjustment: Adjustable

  • Enclosure: Stainless Steel and Valox

  • Conduit Connection: 1/4" - 18 Knockout

  • Designed to meet NEMA 4X

 

 

The 638 Series  Pressure Transmitter

Standard 638 Models.

638 Models - FM Approval
 
Model
Number		 Operating Range - psi Operating Range - bar
 638-4 0-100 0-7
 638-5 0-150 0-10
 638-6 0-200 0-14
 638-7 0-300 0-21
 638-8 0-500 0-35
 638-9 0-750 0-50
 638-10 0-1000 0-69
 638-11 0-2000 0-138
 638-12 0-3000 0-207
 638-13 0-5000 0-345
 638-14 0-7500 0-517
 638-15 0-10000 0-689
 
Model
Number		 Operating Range - psi Operating Range - bar
 638-4-FM 0-100 0-7
 638-5-FM 0-150 0-10
 638-6-FM 0-200 0-14
 638-7-FM 0-300 0-21
 638-8-FM 0-500 0-35
 638-9-FM 0-750 0-50
 638-10-FM 0-1000 0-69
 638-11-FM 0-2000 0-138
 638-12-FM 0-3000 0-207
 638-13-FM 0-5000 0-345
 638-14-FM 0-7500 0-517
 638-15-FM 0-10000 0-689
The Standard 638 Model is more ecnomical!  

 

A Little Bit About Using Zener Barriers and Galvanic Isolators

The MTL5041/5045 Galvanic Isolators provide total intrinsically safe isolation for communication with Dwyer® pressure transmitters approved for location in hazardous areas. Galvanic isolation eliminates the need for a high integrity earth ground required when using shunt diode type safety barriers. DIN rail mounting and plug-in signal and power connectors simplify installation and maintenance.

Compatible Models: 637, 638, 639, 608, 2200, 2900

 

The MTL7706/7787 is an intrinsically safe (IS) shunt-diode barrier that can be used to communicate with and provide isolations for certain Dwyer® transmitters approved for use in hazardous areas. These barriers limit the amount of energy allowed to pass into the hazardous area, which inhibit ignition in flammable atmospheres. Requires high integrity earth ground

Compatible Models: 637, 638, 639, 608, 2200

 

What is a Good ground resistance value?

There is a good deal of confusion as to what constitutes a good ground and what the ground resistance value needs to be. Ideally a ground should be of zero ohms resistance.

There is not one standard ground resistance threshold that is recognized by all agencies. However, the NFPA and IEEE have recommended a ground resistance value of 5.0 ohms or less.

 The NEC has stated to Make sure that system impedance to ground is less than 25 ohms specified in NEC 250.56. In facilities with sensitive equipment it should be 5.0 ohms or less.

The goal in ground resistance is to achieve the lowest ground resistance value possible that makes sense economically and physically.

 

 
Select 638 Standard Model 
Select 638-FM Model 


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